Advanced search options of all kinds, please! The more breadth of search available, the more ability for readers to find the stories they want to read (and then you end up with people like me with libraries of way too many stories, but still).
Steal a page from Royal Road and implement Ongoing, Completed, Hiatus, and Dropped tags for stories! Stories that go X amount of time with no updates are automatically put on Hiatus, and then users can toggle the rest (but can't remove Hiatus manually unless they post a new episode). This plus more search options allows users extremely easily to filter out stories that are canceled if they don't want to see that, or stories that are completed if they are only looking for ongoing work. In my time here, I've stumbled upon several really interesting, awesome-looking comics that just happened to have been dropped 4 years ago, which bummed me out when I started reading and realized that it was probably never gonna be finished. Now, comics actually leave hiatus a LOT more frequently than novels do, so I think auto-Hiatus would need to be something generous, like 3 months or something, but it would help with the perceived overcrowding quite a lot if implemented well.